Armature for dynamo-electric machines



(No Model.) 2 Sheets-Sheet 1.

E. A. EDWARDS;

ARMATURE POR-DYNAMO ELECTRIC MACHINES.

N0. 301,872. Patented July 15, 1884.

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(No Model.)

. E. A. EDWARDS.

ARMATURE FOR DYNAMO ELECTRIC MACHINES. No. 301,872. Patented July16,1884.

UNITED STATES PATENT Erica,

EDcAR A. EDwARDs, or oINcINNATI, AssIeNoR To osoAR M. GOTTSGHALL,TRUsTEE, oE DAYTON, OHIO.

ARMATURE FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 301,872, dated July 15,I884.

' Application filed October 18, 1883.

(N0 model.)

To all whom it may concerto.-

Be it known that I, EDGAR A.EDwARDs, a citizen of the United States, anda resident of Cincinnati, in the county of Hamilton and State of Ohio,have invented certain new and useful Improvementsin Armatures forDynamo-Electric Machines, of which the'following is a specification.

My invention relates to that class of armatures for dynamo or magnetoelectric machines in which the inductive wire is wound wholly upon theexterior surface of a supporting-core, and means are provided so that acurrent of air may be forced through the armature and between or aroundthe coils to carry off any heat generated therein; and its objects areto furnish such a construction as to insure a thorough ventilation ofthe armature, causing the air currents to impinge on as great an extentas possible of the coils, and over the largest possible amount of thecore-surface, and also to construct the inclosing end disks of thearmature, so as to prevent to a great degree, if not totally, thecirculation in the core' of induced or Foucault currents. The means ofaccomplishing these objects will be fully set forth in the descriptionof the accompanying drawings, in which Figure 1 is an elevation of theend drum of the armature; Fig. 2, a section on line 00 m, Fig. 5; Fig.3, adetail sectional view of one of the air-passages in end plate, 0;Fig. 4, an end elevation of the armature-core; Fig. 5, a section on liney y, Fig. 2; Fig. 6, an end view'of the armature with the drumremoved.

A represents the shaft of the armature; B, a core made of diamagneticmaterial, and preferably of wooden disks slipped upon the shaft A, andsecured thereto in any desired manner. 1

0 represents the end plates, rigidly secured to the core B.

6 represents inwardl y-proj eetin g hubs,which may be cast on and withthe end-plate, (l, for more firmly securing the core to the shaft A.

1) represents iron wire rings, which are formed by winding the wire inU-shaped brackets cl, which are insulated upon tie-rods E, which areconnected to the armature-shaft, as substantially shown and described inLetters Patent No. 275,169, granted April 3, 1883.

Other methods of making the iron-wire rings may be employed in lieu ofthe form here shown; but the form here shown I deem the best.

F represents metallic disks or drum-heads, which are rigidly secured tothe periphery of heads O by the flange or rim turned upon the outer edgeof the disks F. These disks are shown of concave form. They may be madeof cylindrical form and still accomplish the same result, though not soperfectly.-

G represents a seam or slit cut from the periphery of disks F inwardlyto the shaft-hole, as shown in Fig. 1.

it represents rivets for uniting the edges formed by the slit G to apiece of rubber, leather, or other insulating material, so as to form aseam and prevent a circulation of electric currents circumferentiallyover the surfaces of disks F when they are made of metal.

II represents an opening formed in disks F around the shaft A, foradmitting air into the interior of the armature.

I represents the transverse coils of the armature.

L represents spaces between these coils, through which the air passesfrom the entrance II, from which it passes up through spaces Ltoair-passages M, which are formed through the heads 0, and connectingwith the spaces L between the armature-coils at the ends of the armaturewith a space, N, which is formed between the series of rings D, outthrough which the air escapes, as indicated by the arrows in Fig. 2, forventilating or keepingthe armaturecoils cool.

By inclosing the ends of the armature with the disk F and admitting theair near the axis, and providing a space between the disk F and thecoils I with air-passages M, N, and c, the centrifugal force developedby revolving the armature propels the air through with great rapidity,and forms an automatieal air-compression device, operating somewhatafter the manner of a blower. This mode of constructing the armature andarranging the air-passages so as to keep a current of air passing at alltimes through and between the transverse and radial coils is veryimportant, and effects a thorough ventilation of the armature.

0, Fig. 4, represents the preferred form of constructing the hubs, thedisks 0 being made of a separate piece of metal from that of disks 0,and secured thereto by screws or bolts.

The arlnz'iture could be made of skeleton form without the diannignetiecore 13 and still embrace the features of invention specified in thelirst three clauses of claim herein.

I elaim-- 1. An armature composed of a series of rings, ll, lutvingair-spaces c, in eoinbiin'ition with air-spaces N and M between therings and coils and core, for conducting currents of air endwise intothe interior of the armature and l discharging it radially outward,substantially as herein set :lorth.

2. A dynamo or magneto electric machine provided with disks 1*,inelosing the ends of the armature, having air-orifices H at or near theaxis, and with air-passages N and M between the rings or coils and corefor carrying the air through the arinatureeoils and discharging itradially outward through spaces a, substantially as herein set forth.

3. An armature eom niised ol' the diallingnetie core 13, havingair-spaces N, a rramged lo a giti'ulinally along periphery of the coreIll and bet\\"een. the rings or cells and core, in eonibt nation withthe rings Ill, having air-spaces between them, and the disks 1*,inehising the ends ol coils l, with the air-orifices l i near the axisA, substantially as herein set forth.

41:. In an armature .I'or a dynamo or magneto electric machine, themetallic disks .l inelo1-sing the ends ol'the coils ol. the armature,provided with the radial seam ll, l'or n'menting the circulation of theiinlueed currents, sub stantially as herein set :l'orth.

In testimony whereof Ili have hereunhi set my hand.

JOHN S. BALDWIN, ANNA Emmnns.

